780s in Japan

was a after ''Ten'ō and before Daidō''. This period spanned the years from August 782 through May 806. The reigning emperor was .

was a after Hōki and before Enryaku. This period lasted from January 781 through August 782. The reigning emperor was .

was a after Jingo-keiun and before ''Ten'ō''. This period spanned the years from October 770 through January 781. The reigning emperor was .